<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>homepage</title>
    <style>
        .left {
            float: left;
            width: 150px;
            height: 250px;
            border: 1px solid gray;
            margin: 50px;
            padding: 10px;
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        .page-name {
            width: 100px;
            height: 50px;
            line-height: 50px;
            vertical-align: bottom;
            margin: 0 auto;
            border-bottom: 1px solid black;
        }

        a {
            text-decoration: none;
        }

        .right {
            width: 1000px;
            height: 1000px;
            margin: 50px;
            float: left;
        }

        iframe {
            width: 1000px;
            height: 1000px;
        }
    </style>
</head>
<body>
<div class="left">
    <div class="page-name">
        <a href="https://www.jianshu.com/p/2581342317ce" target="frame">简书</a>
    </div>
    <div class="page-name">
        <a href="http://www.reins.altervista.org/java/gc1.4.2_faq.html" target="frame">Garbage1</a>
    </div>
    <div class="page-name">
        <a href="https://stackoverflow.com/questions/19154607/how-actually-card-table-and-writer-barrier-works"
           target="frame">StackOverFlow</a>
    </div>
    <div class="page-name">
        <a href="https://docs.oracle.com/javase/8/docs/api/" target="frame">JDK</a>
    </div>
</div>
<div class="right">
    <iframe name="frame"></iframe>
</div>
</body>
</html>